btw that looks very familiar to me lol like the kind of converter that turned my cat blue.. is this a chinese pen ?
It's possible it sneaked in from the back, Syngent somehow did that with his first M200 possibly by submerging the whole unit. The seal may still be fine.
The slide converters Ive only ever seen in Heros,... but they are also used in thinner body pens as the twist kinds dont alway fit all the way.. for the price I would say replace