Numbers - Changes

Good mornging everyone. Iam a new member here, so hi!

To the point: I have a document in excel with numbers, titles etc. My problem is all about the numbers. Propably i pressed a button or i dont know what happened. I've a column with the numbers, about 200.
I made that, like, in the first row i wrote the number 1 then in the second row i wrote the number 2 , i choose the 2 numbers and drag them until 200 so to be automatically.

When i want to write the number 201, for a reason it shows me the number like this 2 0 1 with spaces. Well i dont know how to solve this. I tried to checked every properties in the menu or with right click in the column of the numbers but i couldnt find it. I didnt make any formatting in the document neither changed the font nor the anything else.

The column is like

1
2
3
.
.
.
100
101
.
.
198
199
200
.
2 0 1
2 0 2
2 0 3


these number automatically are going like the 201 (obviously) and also the letters have spaces in the next columns. If i have a title in the row 201
is like 2 0 1 and the title for example International Airoport of London is with spaces.

add 1 in A1. in A2 and drag down = A1+1

Hello Paul thank you for the answer! Hmm, i couldnt solve it.

*Under the row 200 all the text is with spaces..

Maybe the only way is to copy paste the all text and numbers in a new document in excel and done with this, but if there are a lot of data how it will be possible to find this? Also, the lead (spacing) does excist in excel ?