yes, I think that happens because the "predictive interface" gets confused when it sees a couple of hundred extra packages ...
Anyway, you can either do, once:
SetOptions[$FrontEnd, "ShowPredictiveInterface" -> False]
Or, maybe better, if you do actually want the predictive interface otherwise, just
SetOptions[$FrontEndSession, "ShowPredictiveInterface" -> False]
(which you could also add to FeynCalc.m or wherever)
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