GPAs of Junior Transfers

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This is really a question for advisers, though others may have noticed the same... At the school I currently advise (UC Davis) we have a Junior quota; there are a lot of Junior transfers. I am noticing a definite trend that the Junior transfers we pledge have a lot of academic difficulty compared to the non-transfer Juniors and compared to all other classes (Freshmen, Sophomores, occasional Seniors).

Has anyone else noticed anything similar?

It is not a guarantee that the Junior won't make grades, but the chance is very high, let's say over 50%. We look at GPAs before recruitment, but obviously if you were accepted as a transfer student, you have a high GPA from somewhere else (often a community college). Has anyone dealt with something similar at their campus? Do you have any good suggestions/tips for what worked for you?