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When I zoom-in on the map, the features disappear


I'm using SharpMap 1.1 for a project, in particular for drawing features on the map. I noticed that when I zoom in on the map few features disappeas. In attachment there is the map when I zoom out to compare with the map when I zoom-in in the top left part of the image. As you can see the cyan feature disappears and come back when I zoom out again.
What can be the problem?
Thank you

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