Linking this thread created by @LoyceV in case there is someone who is new to this type of problem called "
Clipboard Hijacking".
I was so lucky to noticed this and I have the habit of cramming the last three alphabets of the receivers address after clicking on copy.
Just a suggestion. Check the entire address string to see if the pasted address is the same as the source. Only checking the first/last three characters is not a good practice since the middle part can be modified, which can be tough to spot if you are not paying attention.