It isn't just a case of insufficient light, though. Many of the mottled leaf Maudiae-type Paphs have some predisposition to do this.
It may be an adaptation for growing among rapidly accumulating leaf litter or scrambling among rocks. It certainly varies from plant to plant even within a species or cross. Some may do it most of the time, some only in specific circumstances, some almost never.
This cross is 1/2 Paph tonsum and 1/4 Paph masterisanum, so this isn't a typical callosum/lawrenceanum/sukhakulii hybrid. Both of those species may live in pockets of humus in rocky environments. Paph tonsum in particular prefers a bit more light than most.
I've observed several environmental conditions that may promote this growth habit. Yes, low light - but also crowding, very high humidity, media gone bad. This particular plant may not be entirely happy in the s/h even if it generally grows well.
Especially because this is a Paph tonsum hybrid, higher light for this plant is the first thing to try. Good air circulation and avoid crowding it. But it may always tend toward this leggy habit. If later growths are shorter you could cut the leggy growth and root it as a cutting. You may see root stubs develop along it even well above the media.
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