This problem usually occurs when the type of product being printed on is unknown or the wrong ink is used. Causes and solutions:
Causes of Buffer

If the pad surface is oily, the pad should be thoroughly cleaned before printing.

Causes of Cliché

If the cliché depth is high, a new cliché should be made with less depth.

Causes of Ink

It may be necessary to use a two-component ink instead of a single, in which case the use of two-component ink increases adhesion.
If the ink type is not suitable for the material, a suitable ink should be used according to the technical information card.
If the ratio of ink to hardener is incorrect, the ink and hardener must be remixed in the correct proportions by weight.

Material Originating Causes

If the material surface is dirty, the material surface should be pre-cleaned with alcohol.

Other Reasons

If the material has not been pre-printed or is insufficient, the pre-treatment procedure should be checked and repeated if necessary.
If the required curing time is not met, the parts should be left for a longer period of time before testing the print quality.
If the finishing is not done or insufficient, the use of a heat tunnel and in some cases a flame dryer for the finishing strengthens the adhesion.