Works fine with me with any of the available Window Markers in AC19 INT.
Which localized version of AC19 are you using and which Marker?
Can you post a screenshot of how it looks like?
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AMD Ryzen9 5900X CPU, 64 GB RAM 3600 MHz, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac28