We could not activate your account because this web address is not valid

[Suri.CMS]

Hi All,
Some of my users got the validation emails (when they registered) and the validation link gave an error: We could not activate your account because this web address is not valid.

I checked the links in the validation emails they got and the last part seems to be wrong.

?a=act&u=3884&i=11893332

If I check the activationid in vb_useractivation table for that user, it's different from whatever is sent through validation email.

For example, activationid for that user is 91766347

Now, if I change the URL to:

?a=act&u=3884&i=91766347

Then the validation link works perfectly and the user gets submitted to admin moderation queue.

That means, the validation codes that are sent by vB in the email are wrong for some users.

What could be the possible reason for this ?

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Note1: I am NOT using any 3 rd party modules.

Note2: It's NOT the problem of clicking an incomplete URL. I checked the email my users have got. And the link was perfectly valid & not broken.