What does 259% and -159% CPU Self Time mean?

Hello,

I was testing my game, and suddenly it started to become terribly slow. I paused it and checked CPU Profiler and found this:

259% Self time. I thought the maximum is 100%?

Negative Self time (-159%) !

i.ibb.co/YTDrBKP/22.png

(forum uploader keeps giving me "Unknown error with blob" error)

What does this mean?

Here is the code of the Player3 group:

i.ibb.co/vcVxMBQ/23.png

At any given time, there are about 11 Coins, 6 Obstacles, 22 Sprite, and 4 Bridges in the layout.

The issue doesn't arise at the start, but only after a few minutes of playing.

Thank you!