Extra entries in array

I have an odd issue where when adding results / events to a user empty entries are added to the array, what is strange is that when I a few at a time it appears to be ok, if I go back and add more this is when the entries appear. See below.

Here is the code for adding the events.

function addEvents(pos) {


document.querySelector('#doupdate').addEventListener('click', function(e){console.log(athletes[pos])
  e.preventDefault();
    athletes[pos].comps.events.push(evtupdate.value);
    athletes[pos].comps.evresult.push(resultupdate.value);
    athletes[pos].comps.venue.push(venuup.value)
    athletes[pos].comps.edate.push(dateupdate.value);
    
   updateform.reset();
});

initially I used this code below for listing the events, and I thought that it was the for loop, causing the issue, I used that to display each set of results on a new line.

 for (let { firstName, lastName, eanum, comps:{events,evresult,venue,edate}
 } of athletes) 
               { if (firstName===find || eanum===find ) {
               for (let i=0; i< events.length; i++) 

               {let x=i;
               document.getElementById('athleteres').innerHTML += `<li id="athleteresults-${dellid++}" 
               <span class="n" >  Name: ${firstName} ${lastName} -- Events: ${events[i]} --  Result: 
               ${evresult[i]}<br><span class ="toggle"> Venue: ${venue[i]} -- Date: ${edate[i]}</span> 
               <button id= 'b1' onclick="del2(${dellid - 1},${x},${pos})">🚮Del</button><br><hr>`

So I changed it to a forEach and still get the same results.

The next bit of code is where the user clicks on the add event button. The res refers to a filter from search results.

for (let a of res) {  pos= athletes.indexOf(a);
      document.getElementById('results').innerHTML += `<li id="alc-${nid++}"><span class="n">Loading...
      </span> <button id= 'b1' onclick="del(${nid - 1})">🚮Del<button id='b2' 
      onclick="addEvents(${pos},${nid - 1})"> ➕Events</span></li>`;

      document.querySelector(`#results #alc-${nid - 1} .n`).innerText = a.firstName + ' '+ a.lastName +' '+ a.age +' ' + a.club + ' ' + a.eanum 

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