Why Do NiNi And Nivea Have Problems?

Nivea and NiNi are said to have severe problems, to the point that a fight almost broke out last night at her show in Houston, but why are the two having problems? Sources say they've been having problems for the longest its just all coming out now, but of course when something like this breaks out so does the rumors. Some sources say its because NiNi is dealing with Wayne in a way that makes Nivea feel very uncomfortable since that is her fiancé , some say Nivea  disrespected NiNi in a song, others say they just don't like each other, but we don't know the actual reason as of right now, all we know is that they have issues with each other. The fight that almost happened was captured on video and it started when Nivea walked on stage uninvited booing at NiNi and NiNi threw the mic at her but it missed her and security held them both back from fighting, afterwards NiNi canceled the remainder of the show. We will dig deeper and try to find out exactly why these two divas aren't vibing too much right now and we will let you know when we know!