datatable page change should not fire again.

datatable page change triggers pagechanged event again. Also pageInfo.page restting to zero,

async pageChanged(pageInfo: MdbPaginationChange) {    
console.log(pageInfo)
if (pageInfo.page == 0) {
  this.companies = await this.companyService.getInitialRows(pageInfo);
}
else
if (pageInfo.page > this.companyService.lastPageNumber()) {
  this.companies = await this.companyService.getNextRows(pageInfo);
}
else
if (pageInfo.page < this.companyService.lastPageNumber()) {
  this.companies = await this.companyService.getPreviousRows(pageInfo);
}  

}

companyservice.ts:

async getNextRows(pageInfo:any) {
if (!this.lastVisible) return [];
this.lastPageNumber.set(pageInfo.page);
const companiesCollection = collection(this.db, 'lmscompanies');
const q = query(
  companiesCollection,       
  orderBy('companyName'), 
  startAfter(this.lastVisible), 
  limit(pageInfo.entries)
);
const querySnapshot = await getDocs(q);
if(querySnapshot.size==0)
  return []
this.currentDocs = querySnapshot.docs;
this.firstVisible = querySnapshot.docs[0];
this.lastVisible = querySnapshot.docs[querySnapshot.docs.length - 1];

return this.currentDocs.map(doc => doc.data());

}