diff --git a/code/game/dna/dna2_domutcheck.dm b/code/game/dna/dna2_domutcheck.dm
index df5fba64aa7..8428723cebc 100644
--- a/code/game/dna/dna2_domutcheck.dm
+++ b/code/game/dna/dna2_domutcheck.dm
@@ -23,22 +23,24 @@
 
 		// Prior state
 		var/gene_prior_status = (gene.type in M.active_genes)
+		var/changed = gene_active != gene_prior_status || (gene.flags & GENE_ALWAYS_ACTIVATE)
 
-		if((gene_active && !gene_prior_status) || (gene.flags & GENE_ALWAYS_ACTIVATE))
-			testing("[gene.name] activated!")
-			gene.activate(M,connected,flags)
-			if(M)
-				if(!(gene.flags & GENE_ALWAYS_ACTIVATE))
+		// If gene state has changed:
+		if(changed)
+			// Gene active (or ALWAYS ACTIVATE)
+			if(gene_active || (gene.flags & GENE_ALWAYS_ACTIVATE))
+				testing("[gene.name] activated!")
+				gene.activate(M,connected,flags)
+				if(M)
 					M.active_genes |= gene.type
-				M.update_icon=1
-		else if(!gene_active && gene_prior_status)
-			testing("[gene.name] deactivated!")
-			gene.deactivate(M,connected,flags)
-			if(M)
-				M.active_genes -= gene.type
-				M.update_icon=1
-		//else
-		//	testing("[M] - Failed to activate [gene.name] - [gene_active?"+":"-"]active, [gene_prior_status?"+":"-"]prior")
+					M.update_icon = 1
+			// If Gene is NOT active:
+			else
+				testing("[gene.name] deactivated!")
+				gene.deactivate(M,connected,flags)
+				if(M)
+					M.active_genes -= gene.type
+					M.update_icon = 1
 
 /* Old, inflexibile
 /proc/domutcheck(var/mob/living/M, var/connected, var/flags)
diff --git a/code/game/dna/genes/monkey.dm b/code/game/dna/genes/monkey.dm
index 1ceea87b43c..ebb15a714ad 100644
--- a/code/game/dna/genes/monkey.dm
+++ b/code/game/dna/genes/monkey.dm
@@ -9,6 +9,7 @@
 
 /datum/dna/gene/monkey/activate(var/mob/living/M, var/connected, var/flags)
 	if(!istype(M,/mob/living/carbon/human))
+		testing("Cannot monkey-ify [M], type is [M.type].")
 		return
 	var/mob/living/carbon/human/H = M
 	H.monkeyizing = 1
@@ -86,6 +87,7 @@
 
 /datum/dna/gene/monkey/deactivate(var/mob/living/M, var/connected, var/flags)
 	if(!istype(M,/mob/living/carbon/monkey))
+		testing("Cannot humanize [M], type is [M.type].")
 		return
 	var/mob/living/carbon/monkey/Mo = M
 	Mo.monkeyizing = 1