There are, unfortunately, a great number of things it might be. What topper did you use to vape this liquid you love before you bought your clone RTA? How was it coiled? Did it use pre-fab coils, or built coils? Are you using the same number of coils at the same resistance in your Reload, or have you changed this? What about wattage of the vape? If your previous tank used pre-fabs, are you using the same wicking material as those coils did? Have you switched wire types?
In other words, anything you might have changed switching to a new tank might be the cause, or part of the cause. As
@Tonee N suggests, their might be manufacturing lubricant residue you didn't clean. Breaking it down and giving it a good cleaning is always a good idea. If that doesn't fix it, think about whagt else might have changed from your old tank to your new one, and let us know.