Answer
When creating the bot, some of the initial investment portion will be used as reserve fund to make sure the bot running smoothly in the early of its run. After some time, this reserve fund is not needed anymore, thus you can release it through Releaes Profit feature. Releasing this portion of fund will decrease the initial investment. The profit which is not reduced after you use release profit is the Grid Profit amount, which is varying depend on how much your bot already made.