Thanks for the report, we've identified the problem: it can occur when a user select a recently used "received address" from the drop down list. We're working on a fix for it now. To avoid it until it's fixed, manually type in your receive address.
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This bug was accidentally introduced when we uploaded the new version of our site with the "help and support" system (there were some other changes as well, and apparently one of those changes was less than perfect).
Glad to know and thank you for a quick feedback.