Question - any of y'all ever seen a point of interest / data / structure on your Navi app and then tried to locate it and it a) didn't show up on depth finder and also b) didn't show up on the Navi chip in said depth finder?

When I was fishing Texoma Sunday there was a hump showing up on the app that showed a round shaped, narrow contour (steep), rise in elevation of 27 + feet over near the South East corner of the lake near the dam. When I was over the spot (according to the iphone app), the bottom was pancake flat and there was no contours whatsoever on my Helix screen with my Navi chip.
It was a complete contrast of data between the two Navi sources.

What gives? Is the data on the app corrupt? I could understand if it was a man marked spot, but it was bottom contours.
Any one ever experienced a discrepancy like this?

I have both Lakemaster and Navionics chips in my fish finders as well as Navionics Hot Maps Explorer. I find discrepancies and gross inaccuracies in all 3 all the time. My Helix 5 has Autochart Live and it maps areas entirely different still.