Problem when adding teardrops in Altium
In your Teardrop options window, make sure the "Adjust teardrop size" checkbox is checked and that "Force teardrops" is unchecked. If you have "Force teardrops" checked then it will create the teardrop regions regardless of what's around it, and will ignore the clearance rules.



And, as Koray mentioned, if you have a polygon pour around the teardrop you will need to repour, and if you have a region around the teardrop you will need to manually modify it to meet clearance rules.