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Didn't look like an actual tent, judging by the unkept area I just assumed it was a nook with a curtain in front of it with a large stand up light right next to the opening shown on the right. I also assumed if the op went 13 weeks before asking this may be new to him (no offense).
Genetics makes a lot more sense now, but I don't see how you think a light schedule issues ie a fucked up timer would only cause one of two plants in the same environment to have this issue.
And for the record us big kids have grow rooms.. Not tents... That's the lazy way out
@Mad_Prophessor