I am new to orchid growing so this question may sound stupid.

I have a phal, specifically a Taipei Gold x Brother Laurence, that I bought
about two months ago. It has two spikes with blooms. Both spikes are growing
new blooms while the oldest blooms are wilting. It has grown one new leaf
which is now the same size as the others. The question: one of the bottom
leaves has turned yellow and wilted over the last month or so. Is this
normal or should I be concerned? The other leaves, about four of them,
appear very healthy.

I live in Florida and the plants are kept outdoors in a covered, screened
patio area. This plant gets about 30 minutes of direct sunlight through a
screen in the late afternoon.

Thanks in advance for any insight.

Miller