Doors no longer fit??!!??

Hey all,
Just wanted to see if this was normal. After skinning the trailer with aluminum finally and flush trimming the doors and windows I went to FINALLY reinstall the doors and windows last night. Low and behold, the doors do not fit. It looks like I need to cut almost 1/8-1/4" off of a couple of the corners on both doors to get them in. This baffles me, they fit just fine a couple months ago. Now I understand about expansion/contraction, and my garage is very hot and humid but would it really move this much? I plan on shaving the top radius corners today to get them to fit (windows fit fine by the way which is why I think the doors not fitting is really odd). It wasn't just one side, it was both, and didn't matter which door or which way I put them in (tried reversed, upside down, etc.) Just wanted to know if this much expansion/contraction on 3/4" birch ply is normal? Doors were snug when I put them in a couple months ago, but easily went in. The few coats of spar varnish wouldn't have built a high enough layer to cause this either. Thanks for any knowledge.
Just wanted to see if this was normal. After skinning the trailer with aluminum finally and flush trimming the doors and windows I went to FINALLY reinstall the doors and windows last night. Low and behold, the doors do not fit. It looks like I need to cut almost 1/8-1/4" off of a couple of the corners on both doors to get them in. This baffles me, they fit just fine a couple months ago. Now I understand about expansion/contraction, and my garage is very hot and humid but would it really move this much? I plan on shaving the top radius corners today to get them to fit (windows fit fine by the way which is why I think the doors not fitting is really odd). It wasn't just one side, it was both, and didn't matter which door or which way I put them in (tried reversed, upside down, etc.) Just wanted to know if this much expansion/contraction on 3/4" birch ply is normal? Doors were snug when I put them in a couple months ago, but easily went in. The few coats of spar varnish wouldn't have built a high enough layer to cause this either. Thanks for any knowledge.