Delton keyboard acts as if Ctrl key is pressed

As soon as I plug in the dongle of the Bluetooth Delton keyboard KB200 into the docking station, my computer acts as if the Ctrl key is pressed and does not type anything. I verify it by pressing the Esc button alone which opens the start menu in addition to other keys in Firefox such as pressing t that opens a new tab s that opens the Save As dialogue box.

How to resolve this issue? I had another docking station that this keyboard worked fine when the dongle was plugged into one of its USB slots; although it showed similar problems when plugged into other USB slots.

When I go to Delton's website, I do not find any drivers to install for this keyboard.