Got banned after picking up the flag in ctf

Soo I was recently playing ctf then I randomly got banned after taking the flag? What did I do?
Either way I checked the rules if my texture packs was the cause (I was using A hitbox BUT you cant see enemies through wall which is said in the website that it is allowed as long you cant see through walls) which after that is isnt the cause soo why did I get banned? Heres the screenshot

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