diff --git a/code/game/machinery/doors/airlock.dm b/code/game/machinery/doors/airlock.dm
index 4eed168ad6..477f72ee3b 100644
--- a/code/game/machinery/doors/airlock.dm
+++ b/code/game/machinery/doors/airlock.dm
@@ -688,7 +688,7 @@
 		else
 			. += "It looks very robust."
 
-	if(hasSiliconAccessInArea(user) && (!stat & BROKEN))
+	if(hasSiliconAccessInArea(user) && !(stat & BROKEN))
 		. += "<span class='notice'>Shift-click [src] to [ density ? "open" : "close"] it.</span>"
 		. += "<span class='notice'>Ctrl-click [src] to [ locked ? "raise" : "drop"] its bolts.</span>"
 		. += "<span class='notice'>Alt-click [src] to [ secondsElectrified ? "un-electrify" : "permanently electrify"] it.</span>"
diff --git a/code/game/objects/items/stacks/medical.dm b/code/game/objects/items/stacks/medical.dm
index 6e66f833c2..f888927411 100644
--- a/code/game/objects/items/stacks/medical.dm
+++ b/code/game/objects/items/stacks/medical.dm
@@ -383,7 +383,7 @@
 	. = ..()
 
 /obj/item/stack/medical/mesh/on_attack_hand(mob/user, act_intent = user.a_intent, unarmed_attack_flags)
-	if(!is_open & user.get_inactive_held_item() == src)
+	if(!is_open && (user.get_inactive_held_item() == src))
 		to_chat(user, "<span class='warning'>You need to open [src] first.</span>")
 		return
 	. = ..()
diff --git a/code/game/objects/structures/tables_racks.dm b/code/game/objects/structures/tables_racks.dm
index fba79ac2b0..6356424aaf 100644
--- a/code/game/objects/structures/tables_racks.dm
+++ b/code/game/objects/structures/tables_racks.dm
@@ -127,7 +127,7 @@
 		to_chat(user, "<span class='danger'>Throwing [pushed_mob] onto the table might hurt them!</span>")
 		return
 	var/added_passtable = FALSE
-	if(!pushed_mob.pass_flags & PASSTABLE)
+	if(!(pushed_mob.pass_flags & PASSTABLE))
 		added_passtable = TRUE
 		pushed_mob.pass_flags |= PASSTABLE
 	pushed_mob.Move(src.loc)
diff --git a/code/modules/antagonists/eldritch_cult/eldritch_magic.dm b/code/modules/antagonists/eldritch_cult/eldritch_magic.dm
index 4aeb2e1b73..4d6576ee92 100644
--- a/code/modules/antagonists/eldritch_cult/eldritch_magic.dm
+++ b/code/modules/antagonists/eldritch_cult/eldritch_magic.dm
@@ -50,7 +50,7 @@
 
 /obj/item/melee/touch_attack/mansus_fist/afterattack(atom/target, mob/user, proximity_flag, click_parameters)
 
-	if(!proximity_flag | target == user)
+	if(!proximity_flag || (target == user))
 		return
 	playsound(user, 'sound/items/welder.ogg', 75, TRUE)
 	if(ishuman(target))
diff --git a/code/modules/antagonists/eldritch_cult/knowledge/rust_lore.dm b/code/modules/antagonists/eldritch_cult/knowledge/rust_lore.dm
index 8184beb3aa..aa927ffcfc 100644
--- a/code/modules/antagonists/eldritch_cult/knowledge/rust_lore.dm
+++ b/code/modules/antagonists/eldritch_cult/knowledge/rust_lore.dm
@@ -24,7 +24,7 @@
 	var/check = FALSE
 	if(ismob(target))
 		var/mob/living/mobster = target
-		if(!mobster.mob_biotypes & MOB_ROBOTIC)
+		if(!(mobster.mob_biotypes & MOB_ROBOTIC))
 			return FALSE
 		else
 			check = TRUE
diff --git a/code/modules/research/nanites/nanite_programs.dm b/code/modules/research/nanites/nanite_programs.dm
index d3cf755de2..946dec3f49 100644
--- a/code/modules/research/nanites/nanite_programs.dm
+++ b/code/modules/research/nanites/nanite_programs.dm
@@ -254,14 +254,14 @@
 		software_error()
 
 /datum/nanite_program/proc/on_shock(shock_damage)
-	if(!program_flags & NANITE_SHOCK_IMMUNE)
+	if(!(program_flags & NANITE_SHOCK_IMMUNE))
 		if(prob(10))
 			software_error()
 		else if(prob(33))
 			self_destruct()
 
 /datum/nanite_program/proc/on_minor_shock()
-	if(!program_flags & NANITE_SHOCK_IMMUNE)
+	if(!(program_flags & NANITE_SHOCK_IMMUNE))
 		if(prob(10))
 			software_error()