Unfortunately, the image quality on DR9/DR10 isn't good ~ thankfully, DECaLS DR7 is much better

Interesting things Gravitational lenses
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https://www.legacysurvey.org//viewer/?ra=137.1206&dec=32.9776&layer=ls-dr9-south&zoom=16

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It is possibly the overlap of the DECaLS, MzLS, and the BASS footprints. I am not sure if this is actually gravitational lensing.

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Yep, exactly, if you look at DR9-south or DR10-south (grz), you’ll get similar images to DR7. In the DR9 layer we switch from DECam to MzLS+BASS at Dec = 32.375 degrees.

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