i think you are have taken a cross section. that is why those lines come in display. if this is the case then it would not give any problem in solver.
if it is a cut cell mesh and the lines you are refering are actual mesh lines then it may have bad quality.
please check orthogonal quality. it should be less than 0.1.
there are many posts on this community regarding mesh quality. please check.
If this helps, please mark this post as 'Is Solution' to help others.
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