To survive successfully, snakes must learn their way around in nature (know where they're safe to hide, etc) and they do NOT understand new enclosures- it's like "Where did my world go & how do I find it again?" So that's most likely the main reason. Imagine how you'd feel being abducted by aliens?
But also, double & triple check the temperatures to make sure that nothing is too hot, etc. If you're using UTH, be sure to move the substrate (the way snakes often do) & measure the surface underneath. Same goes for overhead hot spots. The older your snake is (ie. the more 'established' they are in the old home) the more likely they are to be upset with the new stuff. Mostly try to be patient.
Another thing- those hides look too big & too tall. BPs like "cozy" hides with "back pressure" (low ceilings), only one doorway that's just big enough for them to fit thru (after eating), and the overall space not too much bigger than their curled up body is. When you provide hides that are too big, your snake will have trouble feeling safe. BPs are ambush predators, not roaming hunters, so their hideouts are pretty important to them.
Also- there's a lot of open space between hides- providing more "cover" (vines & such he can use for camouflage when "out in the open") can also help a snakes sense of security. BPs are shy for a reason- in the wild, there are plenty of predators waiting to eat them! When I set up a snake's home, I think about how I'd feel in there if I was the snake- not about how well I can watch their every move.
While snakes do take tumbles in the wild, it's also best to minimize them falling if you can- so if you give a branch for them to climb on, don't make them high up & use several so they have more to hang onto.
Your humidity is too high- you want about 55-65% unless in shed, then about 75% should be fine. Keep in mind that just breathing gets harder in very high humidity- BPs do need some humidity for sure, but be sure it's not too much of a good thing. His activity might have been about seeking the more normal (less humid?) air seeping into his home. Time & time again, I've observed my own pets seeking fresh air from windows or doors just because of all the new scents. Your temperature range is good by the way.
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