As you are using the Acrobat desktop application to send document for signature, try sending document online. Open the Acrobat online account (https://acrobat.adobe.com/link/home/) and go to E-sign > Request Sigantures. Check if you still experience the same behavior.
Share the Acrobat and OS version number. If you get any error message, share the screenshot of the message.
Check if the issue occurs with particualr document or with all.