With this issue you should try erasing the coins.json file inside the Barterdex folder.
In Windows you need to access:
%appdata%Roaming/Barterdex folder and find the coins.json file.
In Mac you need to press Command+Shift+G inside the finder
And go to the ~/Library/Application Support/Barterdex Folder
After you do this , you need to restart Barterdex. If the issue still persists we recommend verifying first if you have any pending or stuck swap. Only after you verify this proceed to next step.
Try doing a clean launch by erasing the Barterdex folder inside the Application directory where it's located in each version and launch it again after rebooting your machine.