When you pump air into a bottle, you increase the air pressure inside the bottle. As a result, the air molecules become more densely packed and have higher energy. This increase in pressure and energy causes the temperature inside the bottle to rise.
The cloud you observed when you initially pumped the bottle was formed due to a rapid drop in temperature. This drop in temperature occurred when the air inside the bottle expanded as you released the pressure. As the air expanded, it cooled down significantly. If the air inside was humid or contained water vapor, the sudden cooling caused the water vapor to condense into tiny water droplets, forming a visible cloud.
When you pump the bottle again, you increase the pressure and, in turn, the temperature inside the bottle. The increased temperature prevents the air from cooling down and forming a cloud when you release the pressure. This is why the cloud disappears when you pump the bottle – the air inside remains warmer, and there is no significant cooling to cause condensation.