Oncidium leaf spotting and bulb browning SOS

[YokaYampi]

Hello! im new to oncidums ( usually phals) but this summer i got Oncidium Jairak fragrance 'Ha-Nu-Maan CF3 and as you can see in the pictures it came with a bunch of bulbs but some were brown ish.. grey at the bottom. when repotting it ended up breaking in two. I cut the growths that had a lot of browning at the base off and repotted them into two pots. however a few months later and some new growths ive noticed spotting on the leaves and some bulbs continuing to brown/grey at the bottom.
Since im new to bulbs im not sure what to do!
Any insight would be so appreciated

Pictures

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