Yes, this is how personal edition is supposed to work. When you open/recover a file created by others you get a new user key(internally). Then you can't open the one you created yourself because that is by now having a different key. For details :
"Should you change computers, you will not be able to open your previously created documents with Qlik-
View Personal Edition. In this case, you can choose to recover your files. Recovering files means a new user
key is generated, assigned to the old document and used for all subsequent files, not only for that particular
file. After recovering a file, you can no longer use it on the computer that you created it in.
QlikView will accept 4 user key changes in a document. After that, you will get the error message “Key
length has reached its maximum” and the document will not open any more. The only possibility is to recreate
it from scratch.
Therefore, you should not recover QlikView documents that you did not create (from a forum or from a colleague,
etc.). Doing so will use one of your remaining recovery attempts."
