The phrase "ambiguity stems" is correct and usable in written English.
It can be used when discussing the origins or sources of ambiguity in a particular context, such as language, communication, or interpretation.
Example: "The confusion in the text arises because the ambiguity stems from the author's vague wording."
Alternatives: "ambiguity arises" or "ambiguity originates".
The ambiguity stems from the fact that there is no set number of notes or words one can use from an existing song before it's considered plagiarism.
Little Foot's age ambiguity stems from its final resting place--a cave in Sterkfontein, South Africa.
This ambiguity stems from inconsistent systems of measurement criteria for the onset of anaemia.
This ambiguity stems in part from a complex relation that has been observed to exist among ECM-related cues, actin cytoskeletal organization, and MMP-2 activation.
The source of this ambiguity stems in part from the difficulty in trying to visualize the FG-domains in vivo, which is evident given the lack of resolution even when using state-of-the-art structural techniques such as cryo-tomography (cryo-ET) to detect the FG-domains (Beck et al. 2004, 2007; Stoffler et al. 2003).
The requirement for detailed genetic information to resolve these ambiguities stems from the emergence of the same traits in parallel across the collection.
This avoids ambiguities stemming from ordinary language and facilitates comparisons and developments.
Nevertheless, assessing the adequacy of the number of response options, Tang et al. [ 24] advocated that redundancies and ambiguities stemming from adjacent categories could be accommodated by merging the responses much better, a little better and little change into a single category, while unifying the options a little worse and much worse in another.
Some of the ambiguity may stem from the profession's own guidelines.
These considerations, coupled with the pervasive category ambiguity of word stems in English (most stems can either function as verbs or nouns), made it both necessary and informative to control the grammatical category of the stems used in the experiment.
Whether deliberate or accidental, Mr. Koizumi's ambiguity appears to stem from a variety of causes.
