Three stationary white (cloud-texture and colored) points in the form of a triangle. followed by a fourth single to the SW, same height

Sailing alone. Cloudless skies.
The first sighting lasted about 10 minutes. Stationary and in a triangle formation. Then suddenly appeared to move upwards, very fast and sort of evaporating as they went.
Second sighting about 40 minutes later. A single point this time of about the same size. appeared to drop downwards, increasing in size a little before disappearing upwards very fast, leaving a slightly bigger evaporation trail.