is this word misspelled?

Latin Learning Latin
1

Noctu tamen amici patris Jasonem ex urbe abstulerunt, et cum postero die ad regem REDIISSENT, ei renuntiaverunt puerum mortuum esse.

the verb in bold , rediissent I have only seen spelled with one i , taken from the conjugation of redeo(to return) so do I have a misspelling here or possibly an alternate spelling?

2

Syncope ii => ivi

Syncopated perfect ivi can drop ‘v’ without contracting vowel

redeo, redire, redivi(ii), reditus

So no misspelling. Pluperfect 3 pl subjunctive.