This applies to any non-weapon item:

Case 1: Item has innate %ED. You socket with a +Max or +Min Jewel. No bug.

Case 2: You socket an item with a %ED Jewel. Then you socket with +Max or +Min Jewel. No bug.

Case 3: Item has innate +Max. You socket with a +%ED Jewel. The %ED only applies to minimum, not maximum.

Case 4: Item has innate +Min. You socket with a +%ED Jewel. The %ED only applies to maximum, not minimum.

Case 5: You socket item with a +Max Jewel, then you socket with a +%ED Jewel. The %ED only applies to minimum, not maximum.

Case 6: You socket item with a +Min Jewel, then you socket with a +%ED Jewel. The %ED only applies to maximum, not minimum.

Case 7: You socket an item with a %ED/Max Jewel. The %ED only applies to minimum, not maximum.

Case 8: You socket an item with a %ED/Min Jewel. The %ED only applies to maximum, not minimum.

Case 9: You socket an item with a %ED/Min/Max Jewel. The %ED applies to neither.