I can reproduce this at will.
Start a fresh instance of KoLmafia
Log in
Open the Item Manager
Go to the Creatable tab
Filter on "meat paste"
Select it and click the Create button
-> a dialog box pops up asking "how many". Dismiss the dialog
Close the Item Manager
Open the Item Manager
Go to the Creatable tab
"meat paste" is still selected. That doesn't matter. Select something else and reselect meat paste, if you want.
Click the Create button
-> The dialog asking me for quantity does not open. Nothing happens, seemingly.