Dendrobium Phal buds failing to mature

[FranningtonBear]

I purchased this Dend. Phal. in May 2023 from a large UK DIY store, she was in bloom at the time and whilst still flowering she produced a new cane, it happens to be the one in question.
As you may be able to see, this cane, the one mentioned already as spiked, bloomed and now produced a second spike with 6 buds. Two buds still look great but four have failed.
Has anyone else experienced this? She has also produced a further two canes (3 new ones since purchase!) which are both starting to spike. I would like to try and prevent the same happening with these blooms if possible!

I am a novice (7 years), windowsill grower with a small collection of 12 orchids and have never seen anything like this on my others - a mix of Phals, Dends, Oncidiums and a Cattleya hybrid.