The quick way to find out if it's a mod or not is to go to ACP->Settings->Options. Scroll down to Plugin/Hook System and double click on it. Set it to 'No' and save.
If you can post in all caps after that, then it is a mod doing it.
Then you need to turn that setting back on and disable each mod one at a time until you find the one changing the post to all lower case letters.
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