Plateau Hell

For the vast majority of people, a plateau is the result of inaccurate logging. A major cause of inaccurate logging is not using a food scale to weigh ALL food. Most people who do not use a food scale are eating more calories than they think they are. If you are not using a food scale, then get one and use it to weigh ALL of your food.

You're also varying your calories a lot, which may mean you aren't consistently in a deficit. Set MFP to a reasonable pace of weight loss for your stats, and consistently eat as close as possible to your MFP calorie goal without going over. What constitutes a "reasonable pace" depends on how much weight you're trying to lose, not how quickly you want to lose weight.

Starting a new or more intense exercise routine can cause temporary water weight increase due to the normal muscle repair process. That should not last more than a few weeks. If you are frequently changing your exercise routine, stopping exercise, restarting, etc., then this may be part of what you're seeing. However, accurate food logging is the issue for most people.

tl;dr, Use a food scale consistently if you don't already, pick a reasonable calorie goal and stick to it consistently, stick to a consistent exercise plan if you choose to exercise, give those changes a month before making additional changes.