Neither of your questions actually show good quality, really.

C++ garbage collected compiler is a shopping question (recommendations). We are really not very fond of them here.

Pointer vs. Reference in c++ is closed as too localized.

You seem to be an avid answerer, but you should probably read the how-to-ask sections of the helpcenter a bit deeper, and focus on questions about actual problems you face.

Besides, it's only -4 (or is it -2?) rep.

Basically, the downvotes are probably warranted, and there's no issue here.
If the same user was to then systematically go through all of your answers and downvote, however, that would be automatically reversed.

Neither of your questions actually show good quality, really.

C++ garbage collected compiler is a shopping question (recommendations). We are really not very fond of them here.

Pointer vs. Reference in c++ is closed as too localized.

You seem to be an avid answerer, but you should probably read the how-to-ask sections of the helpcenter a bit deeper, and focus on questions about actual problems you face.

Besides, it's only -4 (or is it -2?) rep.

Basically, the downvotes are probably warranted, and there's no issue here.
If the same user was to then systematically go through all of your answers and downvote, however, that would be automatically reversed.