mysql - Order by with more than 1 of lenght -

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i'm getting weird results query:

select id, nivel, tipo, titulo, texto, ativa  quests_faq  order nivel asc;

the result should this:

5 10 15 20 40 50 55 etc..

instead, sorting first number:

10 15 2 30 40 5 55 etc

my row "nivel" contains integers.
how can use order in case purpose want?

this query may looking converting nivel number

select id, nivel, tipo, titulo, texto, ativa quests_faq order convert( nivel, integer) asc

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