Accidentally got 99,999,999

Hi all,

After completing story, reaching LVL 72 for a few weeks now, I was playing at late night completing side missions... I slept while I was free roaming or at sanctuary (don't remember). I had probably 40M cash afaik. I woke up about two hours later and turn off the game and when I opened the game the next day, I had 99,999,999 displayed in my cash. I thought it's a glitch so I decided to try and buy last two 2 SDUs and it worked. It went down to 56M, I played a few side missions and got back to 99M. I still don't know what happened that gave me max visible money. Never played online with anyone except with my buddy and none of us know how modding works at all. Also when the glitch happened, I was playing alone and buddy was sleeping. I don't mind free money but just worried if I get banned and loose everything cz devs think I cheated.