The naked \x18 and \x19 are present in the EIT tables. This is from a data capture using 'dvbepg' - not sure where I got it from, possibly it was part of dvb-tools at one time:
"2018-12-1 13:30:00",23808,1800,"Bizarre Murders","Little Black Book: A basketball player^Ys lover kills his girlfriend to eliminate her as a love rival, but is caught confessing details of the murder to him. (S4 Ep8)",3,7942,"/E4202019","/S4975814"
The ^Y is the right-single-quote character.
EDIT: According to ETSI EN 300 468, the broadcaster should be sending \xA9 and \xB9 for left and right single quotes.