Ripples in my tank?

My tank seems to be developing ripples on the R side, just above the seat, as shown in the PIC. Anyone else having this problem?

it seems to be a big problem in the states with warping tanks... you guys must have a lot of ethanol in your fuel or just very different fuel

CR its the ETHANOL get some STARTRON and or Stabil makes an Ethanol addative now as well, like I have said I'm using CAM-2 now and always have 5 gallons on hand to at least mix when the snow here finally melts,, E10 sucks and its E85 next,,, WTF