To fix this problem open template
post_thanks_postbit_legacy
Find:
Code:
<if condition="$number_rows == 1"><strong><phrase 1="$post[username]">$vbphrase[post_thanks_users_say]</phrase></strong>
<else /><strong><phrase 1="$post[post_thanks_amount]" 2="$post[username]">$vbphrase[post_thanks_users_say]</phrase></strong></if>
And replace it with:
Code:
<if condition="$number_rows == 1"><strong><phrase 1="$post[username]">$vbphrase[post_thanks_user_says]</phrase></strong>
<else /><strong><phrase 1="$post[post_thanks_amount]" 2="$post[username]">$vbphrase[post_thanks_users_say]</phrase></strong></if>