Texture packs that were once compatible are no longer

I have recently created some texture packs to use in my mobile worlds and I downloaded them. But now that I tried to activate them and use them in game it says they are incompatible. Normally I would think I did something wrong in the download process, but I don’t think I did because I activated  some texture packs that have been working in the latest version/ update and they are now incompatible as well. So they were working this morning and compatible but now that I deactivated and tried reactivating they are now incompatible.