This is because your software vendor (ElementsXS) thinks it is a good idea to use the OSMF tile layer. Actually this is not the case as those tiles are not suitable for anything other than live mapping toolchains. So please report your problem towards the producers of ElementsXS as the fault is to be found in their software planning. By using the OSMF tileservers, they just use the wrong tool for that software (there are plenty of other choices available that would not show this kind of vandalism even while using OSM data).
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