Please feel free to open an issue on the Github repository (https://github.com/pdf/kdeconnect-chrome-extension/issues). The only time I have heard of this was from a Waterfox user, and apparently installing the extension in Firefox fixed it for them on Waterfox for some reason.

I'll try to find some time to look at this, issue created: https://github.com/pdf/kdeconnect-chrome-extension/issues/14