output panel

When I generate my new font I get these [WARNING] messages and I don't know what I am supposed to do about them.

Does anyone know what these warnings in the output Panel mean or how to fix the problems? Thanks in advance!

1:
[WARNING] Pair positioning has two different values in 'kern' feature; choosing the smaller absolute value: Abreve
[WARNING] Pair positioning has two different values in 'kern' feature; choosing the smaller absolute value: Abreve

YES, IT SAYS THIS TWICE IN A ROW for some reason.

I get several of these duplicate warnings. About ten pairs or each problem glyph: Abreve, Aogonek, Emacron, Ebreve (there are 4 duplicates of that warning), Edotaccent, Eogonek, Ecaron, OE, Tcommaaccent, Tcaron, and Tbar.

2:

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