Geometrical shape on the scope lens (+screenshots)

Don't know if it's supposed to be like this but this transparent shape is bugging me.
0_1545591623048_20181223152817_2.jpg
0_1545619703905_20181223232759_1.jpg

last edited by masterchef

Mine looks like this:

0_1545596080660_scope bug.png

Grainy stuff under the rectangle.

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