adding this URL in an IMG tag but I can't seem to get the variable at the end correct it keeps ignoring it:

QR Code:&nbsp;<img src="https://chart.googleapis.com/chart?chs=150x150&cht=qr&chl= https://www.tfaforms.com/FA_ID/?id=" & %%Lead:ID%%  >

two odd things happen when I insert this into an email in the content build:

1. it ignores the variable & %%Lead:ID%%

2. when I come back to the content html it changes the above to <img src="null">