This is likely an issue with your local screen resolution. The miniclient is only able to handle up to 1080p. For example, if you have a 2160p and a 1440p monitor, you would would have to alter the main monitor's resolution to 1080p, but the secondary one can be left at the standard resolution. Also, you should download the screenshot onto your computer, and post using the built-in system. Posting image links and hyperlinks is not advised.