the blue tiles are usually because one building is overlapping another,
the wire traps are the one building that don't have the blue tiles on the edge with footprints on,
this allows you to put the wire traps edge to edge without any gap,
initially you could have a wire trap overlapping the blue footprint tile of another building but this was revised by the dev's and people were getting the 'sea of blue tiles' effect until they moved their wire traps off any blue footprint tile they might have been overlapping,
when you say red tiles it makes me think indoors/outdoors,
some buildings can only be placed outdoors, some can only be placed indoors,
the fact your doors haven't gone red makes me wonder if you've got them fitted in a conflicting manner, I have mine placed on the outside of the wall with the pulley drums at the top facing out,
if the wire traps don't change the situation I'd suggest moving all x3 doors to a location outside, clear of everything, and see if that cures it,
if that doesn't do it then I'd focus on moving one building at a time to try and find the culprit,
the medical bench for instance, when you go to place it you should get a warning of 'can only be place indoors'
watch towers would give the message 'can only be placed outdoors'
if all the tiles are blue or red, when you do move and place in the clear the offending building it should immediately settle down, so just do one building at a time and if it makes no difference put i back exactly where it came from,
I don't think there have been any changes to building placement rules recently but there have been a lot of changes at the server end to improve connection lately and maybe this may have helped the server spot an 'as yet unnoticed' conflict,
I'm sure you'll figure it out soon enough, good luck !