Hello,
It sounds like it could be one of two things: either you have a control on the form that is "Connected To" the Title field, so the changes made in your control are reflecting back to the original list. The second would be, are you sure there isn't an action in the workflow itself that is doing something to the title column (set field, update item, etc..)?
Check the backing list after you submit your original form and make sure you have a value there. What appears on a form is not always that which appears on the backing list. Especially in the case where you have a title field on your main form but its not connected to the Title field, in this case you'd get "No Title" in your backing list.
If you check all of this and still can't figure out the reason, it might be an issue that support could investigate.
Thanks
Hi Mike
Because of your helpful answer, I have checked the controls in use. There I noticed that the field "Title" was listed twice (one was a greyed out). As it turned out, I accidentally activated the layout for smartphones where the control was in use as well and the mode set to "Edit".
After deleting the unnecessary layout, the problem was remedied!
Thank you very much!!!
Excellent, if you could mark my answer as correct I'd appreciate it. Glad it helped!